Chris,

You have to remove the connector that goes from the relay to the GP to measure the GP resistange otherwise you read parallel resistanace thru the other GP. Then its easiest to measure the individual GP resistance using a banana plug in the connector holes.

I found out that when my GP relay didn't work it was because there wae a bad connection between the other connector on the GP relay. R&R it about 10 times fixed it. There was probably corrosion on the contacts and the R&R wore the corrosion away.
The relay has been working OK since.

P E H